63820121 has 4 divisors (see below), whose sum is σ = 63942672. Its totient is φ = 63697572.

The previous prime is 63820117. The next prime is 63820129. The reversal of 63820121 is 12102836.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 63820121 - 2² = 63820117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63820129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60491 + ... + 61536.

It is an arithmetic number, because the mean of its divisors is an integer number (15985668).

Almost surely, 2^63820121 is an apocalyptic number.

It is an amenable number.

63820121 is a deficient number, since it is larger than the sum of its proper divisors (122551).

63820121 is a wasteful number, since it uses less digits than its factorization.

63820121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122550.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 63820121 is about 7988.7496518542. The cubic root of 63820121 is about 399.6249004441.

Adding to 63820121 its reverse (12102836), we get a palindrome (75922957).

The spelling of 63820121 in words is "sixty-three million, eight hundred twenty thousand, one hundred twenty-one".